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90=6x+13
We move all terms to the left:
90-(6x+13)=0
We get rid of parentheses
-6x-13+90=0
We add all the numbers together, and all the variables
-6x+77=0
We move all terms containing x to the left, all other terms to the right
-6x=-77
x=-77/-6
x=12+5/6
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